Simultaneous Interpretation Equipment: Costs and the Smartphone Alternative
Simultaneous interpretation requires a full equipment stack: a booth, a transmitter, receivers, a mixer, and a sound engineer to run it. Published rental price lists put a single receiver at a few hundred yen, but once you add the booth, transmitter, and setup labor, a one-day event can run into the tens of thousands to low hundreds of thousands of yen.
For smaller in-person events, a "BYOD" approach — where attendees use their own phones as the receiver — can remove the need to source, distribute, and collect physical receivers at all. Below is a breakdown of the equipment, real rental costs, and how BYOD compares.
What equipment does simultaneous interpretation need?
In simultaneous interpretation, an interpreter listens to the speaker and translates in real time, and attendees hear the translation through a receiver. Making that work requires several pieces of equipment.
- Interpretation booth: A soundproofed space so the interpreter can focus on the speaker's voice, either a fixed booth or a lighter partition-style unit.
- Transmitter / system controller: Sends the interpreter's audio to receivers over radio or infrared.
- Interpreter console: The headset and microphone the interpreter uses.
- Receivers and earphones: Distributed to attendees and collected afterward.
- Mixer: Balances the room's audio with the interpreted feed.
- Sound engineer: Handles setup, live level adjustments, and teardown.
These costs sit on top of the interpreter's own fee and are typically quoted separately by an AV rental vendor.
How much does equipment rental actually cost?
Two Japanese AV rental vendors publish per-item day rates. As of July 2026, the ranges look like this:
| Item | Approx. day rate | Notes |
|---|---|---|
| Interpretation booth | ¥25,000–33,000 | Soundproofed; simple partitions cost less[1][2] |
| Transmitter / controller | ¥20,000–33,000 | Sends audio to receivers[1][2] |
| Interpreter console | ¥15,000–33,000 | Headset and mic[1][2] |
| Receiver (per unit) | ¥800–1,100 | Includes earphones; need one per attendee[1][2] |
| Mixer | ¥25,000–27,500 | Balances room and interpreted audio[1] |
| Sound engineer | ¥35,000–38,500 / person | Covers setup through teardown[1] |
| Setup / teardown | ¥40,000–66,000 / job | Day-before setup costs more[1] |
Sources: NOVA Interpretation & Translation Services published rate card[1], Hibino Media Technical published rate card[2]. Prices are tax-included, as of July 2026, and vary by vendor and venue.
A rough total: for a 30-person event, adding up a booth, transmitter, interpreter console, 30 receivers, a mixer, a sound engineer, and setup/teardown comes to roughly ¥180,000–260,000 for a single day, based purely on the published list prices above. Travel — and lodging, if the vendor is coming from out of town — is billed separately.
The hidden work of handing out receivers
Cost isn't the only overhead. Someone has to hand out one receiver per attendee at check-in and collect them all again afterward. If the count doesn't add up, it's treated as a loss — and some vendors explicitly bill lost receivers and earphones back to the organizer[2]. Even at a modest scale, that distribution and collection process is real staff time.
BYOD: turning attendees' phones into receivers
A growing alternative skips physical receivers entirely. Attendees scan a QR code, open a page in their own phone's browser, and receive translated audio or captions directly — no receiver hardware to hand out. The venue side only needs a way to capture and send out the speaker's audio.
This removes the purchasing, distribution, collection, and loss-tracking that come with physical receivers. The tradeoff is that attendees are relying on their own phone and their own earphones, so the venue's Wi-Fi or attendees' mobile data becomes part of the equation. Our related article on BYOD event audio covers the mechanics and gotchas in more detail.
| Equipment rental | BYOD (phone receiver) | |
|---|---|---|
| What attendees get | Receiver + earphones (must be returned) | Nothing physical — they use their own phone |
| Cost | Tens of thousands to low hundreds of thousands of yen for the full stack | No equipment rental fee |
| Setup | Booth install, cabling, sound check | Mostly just displaying a QR code |
| What it depends on | Venue PA system, RF/infrared signal | Venue Wi-Fi or attendees' mobile data |
| Best fit | Conferences with hundreds of attendees | In-person events of a few dozen people |
VoxFlight: an option for small events
VoxFlight is a live translation service built for small in-person events. Organizers start a session from an iPhone with an internet connection and display a QR code at the venue. Attendees scan it in their phone's browser and can read translated captions while listening to translated audio — no dedicated transmitter or receiver required.
Audio comes in through the iPhone's built-in microphone or an external mic connected to it. VoxFlight does not persist original or translated audio in its managed databases or storage; external AI provider processing and retention terms are disclosed in the Privacy Policy. Pricing below is planned pricing ahead of general availability. Once paid purchase is available, the App Store processes payment when a session pass is purchased; the purchased pass is consumed when translation starts. The table compares one- and two-language passes.
| Plan | 1 language | 2 languages | Details |
|---|---|---|---|
| 15 minutes / 50 attendees | ¥980 | ¥1,780 | Up to 50 attendees |
| 60 minutes / 50 attendees | ¥3,980 | ¥6,980 | Up to 50 attendees |
| 60 minutes / 100 attendees | ¥5,980 | ¥9,980 | Up to 100 attendees |
For two target languages, the complete two-language pass is purchased once in the App Store for the same duration and attendee limit. It is not an add-on after buying a one-language pass, and the total is shown before purchase.
VoxFlight is currently in pre-launch preparation. Prices above are planned pricing; Two-language passes are included in the planned launch pricing.
VoxFlight isn't a fit for every setting, though. It's not built for medical or legal interpretation, large conferences that staff a dedicated interpreter team, or panel discussions where multiple people talk at once. For those, a human interpretation setup is the right call regardless of the equipment budget. For organizers of smaller meetups and seminars who've been putting off multilingual support because of equipment logistics and cost, it's worth a look.
Sources
- NOVA Interpretation & Translation Services, "Interpretation equipment pricing" (Japanese) https://www.nova.co.jp/biz/tsuhon/equipment/price.html (referenced July 2026)
- Hibino Media Technical, "Infrared simultaneous interpretation system" (Japanese) https://www.media-t.co.jp/rental/sound/interpreter/33303902.php (referenced July 2026)
Frequently asked questions
Can I source simultaneous interpretation equipment myself?
Interpretation booths, transmitters, and mixers are specialist equipment, so most organizers rent them from an AV vendor by giving a headcount and event length for a quote. For smaller in-person events, a BYOD setup that turns attendees' own phones into receivers can remove the equipment rental step entirely.
Do I need one receiver per attendee?
You typically need one receiver per attendee who wants translated audio, plus a few spares for loss or dead batteries. Events with unpredictable headcounts make this hard to estimate accurately in advance.
Does BYOD change the quality of interpretation?
BYOD is about how audio and captions reach attendees — it's a separate question from whether the interpretation itself is done by a human or by AI. A service like VoxFlight delivers AI-generated translation through the browser on an attendee's own phone, so both the equipment and the translation method differ from a traditional interpretation setup.
Do small events of a few dozen people still need an interpretation booth?
Soundproof booths are standard at conferences with hundreds of attendees, but many organizers of smaller meetups and seminars now use simplified systems or BYOD delivery instead. For settings where mistranslation isn't acceptable, a professional interpretation setup is worth considering regardless of event size.